Fix draft round showing Infinity before draft starts (#9)

When draftSlots is empty (pre-draft state), dividing by zero caused
Math.ceil to return Infinity. Guard the division to fall back to round 1.

https://claude.ai/code/session_017mLmGc5wTrESaDeRQHkSPy

Co-authored-by: Claude <noreply@anthropic.com>

app/routes/leagues/$leagueId.draft-board.$seasonId.tsx

@@ -150,7 +150,7 @@ export default function DraftBoard() {
                 {season.league.name} - {season.year} Draft Board
               </h1>
               <div className="flex gap-4 text-sm text-muted-foreground mt-1">
-                <span>Round: {Math.ceil(currentPick / totalTeams)}</span>
+                <span>Round: {totalTeams > 0 ? Math.ceil(currentPick / totalTeams) : 1}</span>
                 <span>Pick: {currentPick}</span>
                 <span className="capitalize">
                   {season.status.replace("_", " ")}

app/routes/leagues/$leagueId.draft.$seasonId.tsx

@@ -654,7 +654,7 @@ export default function DraftRoom() {
   };
 
   // Calculate current round
-  const currentRound = Math.ceil(currentPick / draftSlots.length);
+  const currentRound = draftSlots.length > 0 ? Math.ceil(currentPick / draftSlots.length) : 1;
 
   // Determine whose turn it is
   const totalTeams = draftSlots.length;